A company called Lextech has created an application that lets you control surveillance devices via your iPhone. As well as watching the action on the phone, the app also lets you control the cameras via its touchscreen. See the system in action in a couple of videos after the jump.
I don't think this would mean more security guards sitting on their arses, instead I would expect they would be able to more completely monitor the area they are tasked with surveying. While they're doing their rounds they could check on other areas of the building.
I know the "numbing their arses," comment was to balance the snark ratio for the post but this app seems to be one of the more innovative uses for the iPhone.